US3394346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter circuit
Assignee: RCA Corp
•
Filing: 1964-04-28
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Granted: 1968-07-23
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Expires: 1984-04-28
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:44
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/16; G06V30/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
225 words
IN A SYSTEM FOR READING CHARACTERS, THE COMBINATION COMPRISING: A SCANNER FOR SCANNING SAID CHARACTERS BY A PLURALITY OF SUCCESSIVE SCANLINES OF A PREDETERMINED PERIOD TO GENERATE VIDEO SIGNALS THAT INCLUDES VIDEO PULSES CORRESPONDING TO SAID CHARACTERS AND UNDESIRED NOISE SIGNALS, AND A FILTER COUPLED TO SAID CANNER FOR SUPPRESSING SAID UNDESIRED NOISE SIGNALS AND PASSING SAID VIDEO SIGNAL PULSES, SAID FILTER INCLUDING, A DELAY CIRCUIT EXHIBTING A TIME DELAY OF ONE OF SAID PREDETERMINED PERIODS COUPLED TO SAID SCANNER TO DELAY EACH SCANLINE OF VIDEO SIGNALS FOR ONE SCAN TIME, A FIRST COINCIDENCE CIRCUIT HAVING ONE INPUT TERMINAL COUPLED TO SAID SCANNER AND ANOTHER INPUT TERMINAL COUPLED TO SAID DELAY CIRCUIT TO GENERATE A FIRST SIGNAL UPON THE SIMULTANEOUS COINCIDENCE OF VIDEO SIGNAL PULSES IN BOTH A DELAYED SCAN AND A GENERATED SCAN, A SECOND COINCIDENCE CIRCUIT HAVING ONE INPUT TERMINAL COUPLED TO SAID SCANNER AND ANOTHER INPUT TERMINAL COUPLED TO SAID DELAY CIRCUIT TO GENERATE A SECOND SIGNAL WHENEVER VIDEO SIGNAL PULSES ARE SIMULTANEOUSLY ABSENT FROM BOTH A DELAYED SCAN AND A GENERATED SCAN, AND A BISTABLE FLIP-FLOP COUPLED TO SAID FIRST AND SECOND COINCIDENCE CIRCUITS TO PRODUCE AN OUTPUT SIGNAL, THAT INCLUDES SAID VIDEO SIGNAL PULSES, UPON THE OCCURRENCE OF SAID FIRST SIGNAL AND TO TURN OFF SAID OUTPUT SIGNAL TO SUPPRESS SAID NOISE SIGNALS UPON THE OCCURRENCE OF SAID SECOND SIGNAL.
Claim 2
Dependent Claim
225 words
IN A SYSTEM FOR READING CHARACTERS, THE COMBINATION COMPRISING: A SCANNER FOR SCANNING SAID CHARACTERS BY A PLURALITY OF SUCCESSIVE SCANLINES OF A PREDETERMINED PERIOD TO GENERATE VIDEO SIGNALS THAT INCLUDES VIDEO PULSES CORRESPONDING TO SAID CHARACTERS AND UNDESIRED NOISE SIGNALS, AND A FILTER COUPLED TO SAID CANNER FOR SUPPRESSING SAID UNDESIRED NOISE SIGNALS AND PASSING SAID VIDEO SIGNAL PULSES, SAID FILTER INCLUDING, A DELAY CIRCUIT EXHIBTING A TIME DELAY OF ONE OF SAID PREDETERMINED PERIODS COUPLED TO SAID SCANNER TO DELAY EACH SCANLINE OF VIDEO SIGNALS FOR ONE SCAN TIME, A FIRST COINCIDENCE CIRCUIT HAVING ONE INPUT TERMINAL COUPLED TO SAID SCANNER AND ANOTHER INPUT TERMINAL COUPLED TO SAID DELAY CIRCUIT TO GENERATE A FIRST SIGNAL UPON THE SIMULTANEOUS COINCIDENCE OF VIDEO SIGNAL PULSES IN BOTH A DELAYED SCAN AND A GENERATED SCAN, A SECOND COINCIDENCE CIRCUIT HAVING ONE INPUT TERMINAL COUPLED TO SAID SCANNER AND ANOTHER INPUT TERMINAL COUPLED TO SAID DELAY CIRCUIT TO GENERATE A SECOND SIGNAL WHENEVER VIDEO SIGNAL PULSES ARE SIMULTANEOUSLY ABSENT FROM BOTH A DELAYED SCAN AND A GENERATED SCAN, AND A BISTABLE FLIP-FLOP COUPLED TO SAID FIRST AND SECOND COINCIDENCE CIRCUITS TO PRODUCE AN OUTPUT SIGNAL, THAT INCLUDES SAID VIDEO SIGNAL PULSES, UPON THE OCCURRENCE OF SAID FIRST SIGNAL AND TO TURN OFF SAID OUTPUT SIGNAL TO SUPPRESS SAID NOISE SIGNALS UPON THE OCCURRENCE OF SAID SECOND SIGNAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |